Table of Contents
Here’s the table of contents for today’s edition of Daily Notes.
1. Expected wOBA Leaderboards
2. Notable MLB Games (Including MLB.TV Free Game)
3. Today’s Complete Schedule
Expected wOBA Leaderboards
A Note on What Is Expected wOBA
In the not very distant past, I experimented in the Notes with something called “Expected wRC+.” Expected wRC+ (or, xRC+) was essentially a version of Bradley Woodrum’s Should Hit formula (itself more or less a FIP for hitters with BABIP included) but with regressed (as opposed to raw) home-run, walk, and strikeout rates as the inputs. Also, for xRC+, BABIP was replaced by expected BABIP (xBABIP), per the formula (adjusted for 2012 league averages) proposed by user slash12 at Beyond the Boxscore in 2009.
The idea behind xRC+ was to estimate something like a player’s true talent over the course of X plate appearances. Of course, the methodology wasn’t flawless: wRC+ is a park-adjusted stat, for example, while the inputs for xRC+ were all expressly not park-adjusted. Also, while I’d adjusted the xBABIP formula to produce a league-average figure equivalent to the league-average for BABIP in 2012, it’s also the case that the I had not addressed the way in which the different inputs were weighted against each other. (Because I don’t know how to do that, is why.)
Fortunately, since my initial clumsy experiments with xRC+, Woodrum has made some new and useful contributions apropos fielding-independent offense — not only producing a formula to express a fielding-independent offensive stat in terms of wOBA (as opposed to wRC+), but also revisiting slash12’s xBABIP formula to best represent the current offensive (and, of course, defensive) environment.
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